<template>
  <div class="todo-herder">
   <input type="text" placeholder="请输入任务名称，按回车键确认" v-model="title" @keyup.enter="add">
  </div>
</template>

<script>
//自动生成自定义id
import {nanoid} from 'nanoid'
export default {
name: "MyHeader",
  data(){
  return{
    title: ''
  }
  },
  methods:{
  add(){
    //校验是否输入
    if (!this.title.trim()) return alert('输入不能为空')
    //包装成一个todo对象
   const todoObj = {id:nanoid(),title:this.title,done:false}
    //通知app添加一个todo对象
  this.$emit('addTodo',todoObj)
    //清空输入
    this.title=''
  }
  },
  props:['addTodo']
}

</script>

<style scoped>
.todo-herder input{
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}
.todo-herder input:focus{
  outline: none;
  border-color: rgba(82,168,236,0.8);
  box-shadow: inset 0 1px 1px rgba(0,0,0,0.075),0 0 8px rgba(82,168,236,0.6);
}
</style>